Exposure attachment for cameras



Oct. 2 1923.

I 1,469,435 G. J. FISCHER EXPOSURE ATTACHMENT FOR CAMERAS FiLed Oct. 14, 1920 s Sheens-Shet 1 @445 34. 3fc /0 II Oct. 2 1923.

G. J. FISCHER EXPOSURE ATTACHMENT FOR CAMERAS Filed 00$. 14; 1920v 6 Sheets-Sheet 2 G J. FISCHER EXPOSURE ATTACHMENT FOR CAMERAS m \ln lid-e vwmtoz ()ct. 2,1923. v 4 1,469,435 I G. J. FISCHER I EXPOSURE ATTACHMENT FOR CAMERAS Filed Oct. 14, 1920 6 Sheets-Sheet 4 Y r, r 2: G a. 5:

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V} w b 0 wmtoz G. J. FISCHER EXPOSURE ATTACHMENT FOR CAMERAS Filed Oct. 14. 1920 Nun a b a 4 M n m H [.mmu. mu WN Oct. 2 1923. 1,469,435

. cs. J. FISCHER EXPOSURE ATTACHMENT FOR CAMERAS Filed Oct. 14. 1920 e Sheets-Sheet e Patented fist. 2, 1923.

EXPOSURE ATTACHIIIENT FOB CAMERAS.

Application mes october 14,1920. Serial rma aesa T aZZ whom it may concern Be it known that I, GEORGE J. FISCHER,

. citizen of the United States, and resident of Long Island City, in the'county of Queens and State of New York, have invented certain, new and useful Improvements in 'Exposure Attachments for Cameras, of which the following is a specification. I

This invention relates to cameras and has for its object to provide an attachment for cameras, which maybe attached to any camera wherein an automatic shutter control for instantaneous or time exposures is employed,

More specifically the object of the invention is to control the shutter of the camera for instantaneous and time exposures and to release successively signalling means synchronously with the several successiveoperations of the shutter, preparatory to and during .the taking of a picture, as may be predetermined by the operator and indicated on dials provided in thedevice, whereby the operator may know from the. signals employed the length of time before the shutter opens, the instant when the shutter is opened, the duration of the exposure and the instant when the shutter is closed. A further object of the invention is to provide a device of the character described, in which a partial vacuum may be employed in con1unct1on wlth spring mechanism for operating the device. A further object is to provide means whereby the connection may be readily made with the antinous releasing means of the shutter, and a further object is to provide means which may be readily controlled for adjusting the parts of'the device for regulating the action of the mechanism and a further object is to provide suitable air valves and in lets and means for controlling the same.

Vith these and other objects in view, reference may be had to the drawings, in which Figure 1 is the side elevation of the attachrent showing it in connection with a camera. the body ofwhich is broken away and 7 showing the antinous release as connected therewith and Fig. 2 is a transverse vertical section on the line 22 of Fig. 1, showing the means for setting the indicator for indicating the time of exposure in seconds on a dial. Fig. 3 is a sectional plan ofthedevice on the line 33 of Fig. 1. Fig; l is a vertical transverse sectional view onthe line 4 of Fig. Fig. 5 is a longitudinal sectional view taken on the vertical plane of the line 55 of Fig. 6. Fig. 6 is an end am tion of the device, showing the dial and .in

. dicator for regulating the time .of exposure.

the line 8 ,8 of Fig; 7, looking toward the front of the device. Fig. 9 is an irregular-.-

longitudinal sectionalview', being one of the series of progressive views from- 91. 112 inclusive, showing the progressive. stages or operation of the device while the'picture is being taken; 9 also shows the shutter device of the camera and a fragmentary section of the antinous' release connected therewith, disclosing the operationthereof and its connection with the attachment. Fig.

10. is an irregular longitudinal sectional view, being one of the series of progressive views and showing the parts at the second stage in the operation thereof, while thepicture is being taken. Fig. 11 is an irregular longitudinal sectional View, being one of the series of progressive views, showing the parts of the device at the third stage of op eration, while'a picture is being taken. Fig. 12 is an irregular longitudinal sectional view, showing the parts of the device at, the fourth stage of operation, while the picture is being taken. Fig, 13 is a transverse sectional view on the line '1313 in Fig. 5. Fig. ll is a. front elevation of the device. Fig. 15 is a fvertical sectional view on the. line 1515 of Fig. l. Fig.16 is a fragmentary sectional view on the line" 1616. of Fig. 17. Fig. 17 is a transverse sectional view on the line, 17-17 of Fig.16, showing the air valve and means for controlling the same. small camera, equipped with my attachment rice; I

enonc-E J. rrscnnn, or none rs'nann CITY, nEwYonK:

, ular sectional View taken substantially'on Fig. 18 is a perspective viewof a and connected with the antinous release of r operation, while a picture is being taken.

20'fis a perspective view showing the signalling device as it appears atjthe third,

21 is a view showingthesigstage of operation, while a plcture is being takenv and F: g

rialling device as it appears at the fourth stage ot operation, while the picture is being p 7 e V I sleeve 26 engage the shoulders 71 and serve taken or when the operation has-been completed. V r

In the several v ews .of the device in the drawings corresponding reference numerals relate to corresponding 1) artsthroughoutthe drawings; in whlch 10 indicates the casing, 11 a cylindrical chamber thereof, 12 a cylina Y 0' drical member fitted within the chamber 11,

fbeiiig'open atone end and elo sedlat the other 'd. Thecylindricalmember is provided with a threaded seat inan extension 13, in .whi'ch the end of the rod leis disposed on "which is supportedahelically wound spring l5. ithrough therod 14 near its threaded end is an a'ir -passage l6 and communicating jivith' theain-passage 16'is a conical valve seat and air-passage. The threaded cham- V her 13 of the cylindrical member 12 isfun ther extendedlas at18 and is providedwith the threaded opening, in which a threaded iscrew valve l9 is disposed. The valve 19 is provided with a longitudinal groove 20',

'wh ich ser*. es iis an air-passage for admitting through the valve seatand air-passage "l7 'tothe ain'passage 16 of the rod le. The flow ofarflthrough this valve may be regulatedby rotating the screw valve 19 so as toudmit morei or less air through the conical valve se and ir-Pa ag SO s r "late' thequantity of air 'to be admitted to a partial ifacuum within the chamber. The tubular member 21 is provided to "fr eceive the impact or force' exerted by the helical spring 15, which pushes the piston {and connective parts forward when the I mechanism is in operation; The piston 21 is provided witha head 22, wh ich engages the interior peripheral surface of the tubular ,lh herY l'Q an d pjackingmeansQ is disposed garoundthe'head and retained in position by I 1lflOIIrthechamber-251 Within the cylin .d'ricitl member 1 2 on the forward endoii the ular piston 2l is a rotatable and longitu- Vdinal movable. sleeve 26, having a circular head thereonQT. Inthe circular head 27 of j jl'he sleeve 26 isprovided a. recess 28 01"- larger diameter than that of the body oi? the sleeve and adapted to admit the head 29 of the screw 30, whichis threaded into a threaded opening 21 in the forward end ofthe tubular" head 29 vof the s cr ew 30ofa'width corresponding with the depthot the recess 28 in the circular head 27 of thefsleeve 26, thereby formingan annularchainber 32 within ,the lcircularhead' of the sleevebetwe'en the Screw 80f and the head of thesleeve 27. A coilspring 3.3 is disposed within the chamber 32 and serves to normally retain the sleeve 26 in engagment with the seat or 'slhoulderQlVof .the tubular piston 21. -II1- clined shoulders 21 are provided on the circular plate 25L to prevent leakage of.

iston21. Ajflange 3l';is provided on the seat 21* of the tubular piston 21 and correspondingrecesses in the sleeve 26 of the to normally retain the sleeve 26 against rotation, relative to the tubular piston 21.

When it is desired to rotate the sleeve 26, however, therinclined shoulders 21 and 26* cooperate to enforce the sleeve 26 outwardly .7

from the seat 21', so as to permit rotation of the sleeve. This longitudinal movement of the sleeve necessary to allow it to be forced from its seat so as to permit of rotation the seat 21 are divided into six equal spaces and six corresponding inclined shoulders and recesses on the seat and in the sleeve are provided, whereby the'sleeve may be r'otatedonesixth of a revolution as two-sixths, threesixths,ftour-sixths, five-sixths or. a complete revolution and retained; at any one ofsald positions. In like manner a series of recesses 26 are provided at spaced distances in the peripheral. surface of the sleeve'26, one being disposed in a radial plane with each of the inclinedrecesses'2l 7 These are arranged at spaced distances, however, longitudinally of whereby the thrust from the initial position may be regulated, thus lengthening or shortening the time, which ittakes the piston to travel from its init-ia-lposition to its final position for regulating the time of exposure or any interval of time contemplatedin the operation of'preparmg for and taking the picture. Itis designed that the screw head 29 will fit loosely within the chamber 28 of the circular head'27 of the sleeve 26 and that the screw 30 will be rigidly set or frictionallv held in the end of the ttibular piston 91 so that the circularhead 27 and the sleeve 26 be rotated whilethe screw 30 andthe head' 29 remain stationary. lVith this in view, reference may be had to Fig. l l,-in which the face of the circular head 2'? and the head 29 of the screw 30 are shown. As

.will be seen the face 01"- the head is divided if fiveseconds isto be the desired interval, the dial of the head27 is turned so that 5' is in the direction indicated by the arrow.

However, it 30 seconds I is the interval of time desired,3() will be disposedin the direction indicated by the arrowand the sleeve {26 will then be disposed so that the recess rethe sleeve 26 and serve'a's a gauge for regu q 'latin the longitudinal thrust of the piston quisite for regulating the interval of time desired, as indicated by the dial will be in proper position to, meet the requirement condition, as follows: V

A spring actuated lever 34 shownin Fig.

13 and other views of the drawings is supported upon a bearing 35. The bearing 35 is supported on a plate 36, which is secured in the bottom oft-he casing 10 by screws 36 and a spring 37 is provided, which normally retains the lever 34 in engagement with the sleeve 26. The lever is formed so that its central portionconforms to the curvature of the sleeve 26 and a tooth orpawl 34 engages sleeve by gripping the circular head 27 therei of to rotate the same, it will tend to raise the tooth 34 from its seat in any-of the recesses 26 or with the adjustment oiilthe sleeve for regulating the interval of time, may be made without the necessity of manually gripping the lever to release the tooth 34 from its seat in any of the recesses 26 However, provision is made for manually releasing the lever by means of the extension 34ithereot and the nib 34 by which the lever may be moved from the sleeve 26, the slot 38 being provided to afford free movement or thelever. An air outlet 39 is provided in tubular piston 21 and a spring-valve 40 is secured upon the piston by a screw 41. The spring valve 40 is normally elevated at the central portion 40% so that when this point is slightly depressed the end 40 thereof serves to close the air inlet 39, but when further depressed the spring valve at 40 serves as a fulcrum to raisethe end 4O thereby the escape or leakageof the air through the inlet 39. The lug 42 is provided on the interior of the cylinder 12, which serves to depress the spring at 40. When the piston has advanced during its operation, so as to bring the point 4O under the lug 42 permit ting a slight leakage of the air through the inlet 39 and permitting a morerapid movement of the piston'in the forward direction.

A cam 43 is disposed in a longitudinal plane with the end of the lug 42 at the arms 43 and 43 The upper end of the arms are dis posed in a longitudinal groove or recess 44 in the casing 10 and are adapted to move longitudinally therein; Threaded bores are provided through the said arms 43 and 43 and a rod 45 is threaded through the said bores .is rotatably held in bearings46 and 47. A pinion-4S iskeyed on the rod and meshes with the gear 49. A dial plate which serves also as a closure for the end of the device 50 has a central opening therethrough and a smaller openmg at its upper left hand portion to engage'the (infill o f -the "rod 45, which projects therethrough when the plate is in position on the. end of the device, where it is secured by screws 50 50 50 and 50,

when hand nut 51' is disposed upon the=end of the rod '45 and fixed with a set screw 51,

so that the rod may be rotated by the hand 1 nut 51 so as to adjust the cam 43 longitudinally thereon, so that when the point 40 of;

the spring 40 contacts wit-lithe cam'43,ithe

position; or point at which thejcontact will first take place may bevaried bythe adjust ment ofthe cam 43 longitudinally of the device upon the threaded rod 45, so that the interval or time may be'jvaried after the spring 40 has been actuated by the lug 42 and before contacting with the cam'43, which serves to-continuously depress the springand open the inlet 39 for-admission of air until the exposure of the negative in the camera is finished. Thus hastening the forward movement of the piston during the interval of time whenthe spring 40 is depressed by the cam 43. a

The gear 4911s i n l p n the'eX sion 13- of the cylindrical member 12,'so as to be rotatable thereon and the gear 49 has an extension 49, which projects through the central opening ofthedial plate 5 0. An indicator 52 is secured upon the-extension 49 of the cylindrical member 12, so as to be rotatable therewith andthe central opening 7 r is vprovided through the indicator to admit v the threaded screw valve 20 and is rotatable ioo correspondingly with the gear 49 when thearound said screw valve sothat it may move gear is rotated by the rotation of the hand nut 51. The gear 49 is caused to'rotate thereby rotating the indicator 52, causingjit to move1aro-und in a. circular direction over The dial may the in the dial plate 50.

tegrally formed with the closure plate 50' or Y the dial may be inscribed upon a separate plate and superposed upon theclosure plate V 50. In either case the dial upon the dial. plate is divided in anequally spaced advance and the main advances or spaces thereof are llO or fractions of a second. When adjusting" the attachmentfor regulating the interval of time desired between the timethe spring is, compressed'by the plu 42and when it is subsequently depressed by the cam 43, the

hand nut 51 will be rotated until the indicator points to the numeral 5, 10 or 15 or the desired numeral-indicating the seconds of time pwhich" will indicate that when the indicator is so disposed it. will take a num berof seconds equal to the numeral to which the indicator poinis for the piston to travel a vdistance equal to the. space between the plug 42 and the cam 43, when the cam is rel atively adjustedi upon the threaded rod ,l

and vvhen the indicator points to the number designated.

1 and longitudinally movable 'th crethrough without friction; An eccentrical'ly disposed 'lhustheinterval of time torsuch movernent equal to the distance tethe lug 4:2 and the cam 4:3 may be varied'l roma traction ot' one second of a full minute or tractlon thereef or a full minute and fraction thereof or longer.

It more than one rotation is required to adpist the posltionotthe cam .ot' the machine, .in su ch a case the indicator will register one minute plus 5 10 or seconds or a fractional partfthereoi as the indicator may indicateupon the dial.

A further featureof the device is means provided vfor actuating the release otthe automatic shutter DI the camera, astollows: x

A plate 53 is seated within morti'ce provided in the front end ofthe casing 10 and therein secured by screws53f, 53* and This plate has a central opening .53 through which'the' sleeve surrounding the pistonfQl passes, so as tobefree'ly rotatable therein opening'53 is also provided through the plate and. the circular recess 53 is provided concentricallywith opening 53 in the front surface from the outer surface of the plate and a communicating recess 53 of less depth than the recess 53 is provided inthe corresponding surface of the'plate 53 and serves as a housing, or bifurcated retaining member 5a, having thearm 5%, the hand clip 54? and the corresponding .arms 5 Pand 54 Whichis slidably disposed therem. The retaining member 54 when in 21 1305111011 shown .in Fig. 1e serves to retain a circular plate of the antinous release within the recess'z5z3fl but when it is withdrawn from Qthat positioninto the recess 58 theilisk 55 of the antinous release may be removed from the recess 53 A plate .56 with thecentral opening therethrough for the sleeve 26 and aconcentrically disposed opening of a correspondmg circular diameter with the circular recess 53 of the plate 58; is disposed over the front end of the device covering 7 the plate 53 and the recess 53 and serving to retain the retaining member in a housing or recess 53 providing for three reciprocal sliding movements of the retaining member 54 in the housing or recess 53% provided'therefor, as required for retaining or releasing the disk 55 of the antinous release as hereinbefore described. The plate 56 is secured'in position upon the end of the device by the screws 56*, 56 56 and 56, 311d '15 cut away at 56 to provide for manipulating the nib 34 of the lever 84. The

ant-inous release shown inthe drawings is of the type usually employed for actuating automatic camera shutters and comprisesfa disk 55 held by theretaining member-54, the sleeve 555a }flange 55 adjacent the sleeve 55 andfithe shaft 55 to which is joined a fiexible shatt55 The shaft 55 projects beyond the disk 55'an d terminates with the ball upon its end55 within the sleeve 155 and surrounding the shat't 55 is a'helically Wouud spring which serves to force the shatt outwardly, relative to the sleeve 55 fbut'which yields under compression to admit to the 1 movement of the shatt inwardly, relatively to the sleeve for actuating theantinousre- I lease of the camera shutter.

When-the disk is disposed in the recess 53 and reta ned by the retaining member 54-, the sleeve 55" is securely heldl'in the position indicated in thedrawings "Reference being particularly: had tol igures 9, 10 11 and 12. 'And the shaft 55normally extends inwardly to the position indicated in Fig. 9 and other views of the drawings. V

The camera shutter is actuated by the movement or" the shaft 55 as controlled'by the mechanism of my device which is as,

follows I A plunger 57 s shdably mounted upon the "tubular p iston QLand-as a nosing 5'8,which is normally disposed against a shoulder 58 of the casing 10. 'lhe'nosing'58 is'slidably movable inn rectangular recess 58 provided in the lower side portion of the casing. The mounting oi the plunger consists of segmental portion or" a cylinder oft which substantially 90 thereofiscut away, shown in Fig. at and Fig. 8 and other views-of the drawings, so as topermit theplunger-to move freely along the tubular piston past the spring valve 40 as herein-before described; i

The nosing of the plunger has a recess therethrough as 589 and iii the aperture or recess 58 a lever is mountedon a pivotal bearing 59% The lever has an arm 59 eX -teiiding rearwardly and an arm 59 extending forwardly from the pivotal bearing and a. spring 60 is connected to the lugf59 of the lever 59 at one of its ends and the other end thereof is connected 'to'a lug 61 on the plunger 58 and serves to yieldingly retain the forward end of the lever 59' in an upwardly'inclined' positionlso thatthe rearward end of the lever 59 is yieldingly'held" in a downward position, so asto contact withthelnner peripheral surface of the cylindrical member l2,so as to be slidable pressure of the metalor material of which it'is :formed which tends to force the forspeed with the piston.

n'ib 3 so asto release the tooth or pall 34 from the recess of the sleeve 26, in which'it. may have been disposed preparatory to lop a ition as f The tubular piston 21 is then forced forwardly 7 within the "cylindrical 'niemh'er 12 by means of the spring 15,]carryi" with it the member 62, which impinges net the end of the lever 59 and moves plunger 58 forwardly at a corresponding As the piston advances the end 59? ofthe lever 5.9 reachesthe end of the cylindrical member 12 and drops into a recess 12 so that the upper surface thereof is flush with the inner surface of the cylindrical member12 and the tena the sion spring 60 exerted upon the forward arm f rce the ba11 55 against the plunger 58 andv 59 of the lever 59 tends to force the'arm 59 of the lever downwardly into the said .recess 12 and retain it in such position. When this has occured the plane end surface 62 of the end 62' of the member 62 glides smoothly and freely over the end59 ofthe lever 59 and as the piston continues in its forward I movement, the member slidesfalong theupper surface of the lever59 through the aperture or recess 58 of the plunger 58. If the forward end 62 of. the member 62 ispassed through the said aperture 58, then the force of the spring in the member 62 will bearupon the forward arm 59 ofthe lever 59 and ward arm 59 thereof and raise it out of the recess l2 and bring it upward into contact with the end surface of the spring member 62. To be certain that the arm 59 ofthe lever 59 is thus released from the recess'l2 on its juncture in the operationand in case the tension of the spring 60, which tends to rethe arm 59? of the lever 59 in said re-' cess 12 should he great enough to overcome. the force of the spring member 62, to lower the arm 59 and release the end of the arm 59 from said recess, Ihaveprovided a cam;

actuating member 63, which is secured in the bottom of the casing byscrew 63, which will engage the cam'. surface 62 ofthe spring member 62 and as the spring member 62 is further carried forwardby the piston15, the cam 62 will engage theunderv surfaceof the scribed, engaging against the end surfaeeof the spring member 62, whereby the, plunger 58 is released and free to move in a rearward direction. I I 4 While the plunger58was moving forward with the piston and in contactwith the ball 55 of the shaft 55 the spring 559111 the" sleeve 55%was under compression and the flexible shaft 55mm moved forward inth'e I fieizible tube 55, asrequired for actuating the automatic shutter of the camera, but

pressure "of the automatic shutter, so that the shutter may be closed; In order to permit when the shutter hasfbe'en opened, it is necessary that the compression be relax'edand the movement of the shaft reversed'by the air thefree movement of the shaft in the reverse it'mayjbe automaticallygclosed. wh n the I lever 59 has been disposed in the position described,as shown in Fig. 11,. then the action 'of the spring 55.upon the shaft 55 toencarry it. rearwardly so as to dispose. the; lever 59 telescopicallyunderneath the spring member 62, which operation is illustrated in Figures 11 and 12, so that the plunger may I be returned to the normal posit on, where it rests against the shoulder 58 0f the casing and the :shaft 59 of the antinous release is zrefiexibly moved, so as to release the shutter and permitfthe closing of the mechanism shutter,

The signal means employed in the lilQVlCQ ;comprises a pluralityof folded or hinged members. Thehinged members 64;, 65 and 66, which'are normallytdisposedz in overlapv ment and secured in this positionby means of a retaining member; 67. .wlnwh 1s rig dlv easing into which the end of theshaft 68' extends. A lever7l is keyed, upon the end :shown in Figures 10, 11 and-12. The pin serves to actuate the lever 71, so asto carry .it forward with the movement of, the piedepress it so as to relatively elevate the rear-,' ping relation against one side. of the attachof the shaft'YO and is movable in anfarc I I of substantially 90 from the initial or first i 1 position, shown in Figures 7 and 9 tojthe second, third and fourth or final position.

72' disposed in the tubular piston 21 and.

cam actuating member 63 and be forcedtical or initial po'sition sho wn in Fig. 1b

and when the lever assumes the position shown in Fig. 10, the retaining member 67 downwardlyagainst the arm 59 of the lever 59, thereby insuring the releaseof the Iarm 59 of the lever 59,'sothat the lever 59 ill assume the position hereinbefore' deis sufiiciently inclined-to release the {folding niembertiet, which is immediately swung held upon the shaft .68.- The shaft 68 .is l I wardly in an are or seini-circular path to: the position shown in Fig. 19 of the drawing's, as the lever is further advanced to- V T ward the position shown in Fig.111 .lhe

folding member65 is released and thrown upwardly to the position shown in Fig. 20 and when the lever has reached its last or final stage, shown in Fig. 12, the folding" member '66 is released and thrown in the position upwardly shown in Fig.1 of the drawings. 7 The signalling means is arranged to] employ colors for signalling, for ex; ample,when the folding members 54, 65 and 66 are in their normalposition, as shown in Fig; 1 and Fig.18,theouter surface thereof is back, as shown in F gil8. "The folding.

member 64; being nearest to the eye is colored black, corresponding with the color of the exterior of the device. The opposite surface 20' of this folc'ling member 64 is coloredred and the exterior surface of the next succeeding foldingmemberf65 is also colored'red, so.

7 that when the member 64: is disposed in the at a considerable distance The inside of the folding inemberi65 is colored blue andthe' outside surface of the member 66 is also coloredblue, .so that when the member 6a "is elevated to the position shown. in Fig.

20,. a hlue signalof a size equal to twice the extent of one of said folding members is pre sentedto the eye and at the inside of thefolding member Stand he inside of the folding member 66' and the surface of the camera casing against which the member 66 is disposed within the normal position, is.

white so thatwhen the member 66 is elevated to the position shown in Fig. 21, the

white signal of a size equal to twice the extent of one. of thefoldino: members is visible to the eye. A different code of color signals may be employed, if" desired, without departing from the spirit or'scope of this invention.

To retain the device upon a camera, I

,have provided slotted plates 73 andM.

which are held in positionb'y screws B and] 74 seated in the bottom of the casing 10.

' Recesses 75 and 7 6 are provided in the hot tom of the casing, for which the plates '73 and 74 are disposed posts or screws 77 and 78 are disposed in the frameof: a camera 79',

so that the heads thereof project a slight distance above he surface. of the. camera frame, so thatthe heads may engage with-- .in the slotted opening of the plates 73 and 74 held above the recesses and76. in'the bottom of thecasing 1Q; Theslottedplates 73and 74 have a larger opening/Z3 and I 'T i 'at one end thereof, adapted to admit; the 'heads of thescrews TSiai l .79, but the remaining portion of the slotted opening is of a width substantiallythe same as the diameter of the shank of the screws, so {that when the head of the screwsare disposed.

through the circular openings athone end' of the slotted plates, the attachment can.

he moved so as to direct the screws into the narrower portion of the slotted openings, so

as to engage'the head of the screws and thus 7 serve to retain the attachment in the fixed position upon the camera. T is form of the retaining means" for hold ng the attachment uponthe camera may be greatly varied so "that the parts may be frictionally engaged or held by spring, means or any desired means may be employed for removably retaini'ngthe attachment upon the frame of.

a camera. 1

ilVhenthe deviceis to be used in taking a picture, thepiston 21 is compressed within the casing to substantially a position,

shown in Figs. :1, 3, 5, 7 and 9, but it is not necessary to depress the piston to the 'eX-'- treme position shown 111 said figures, since may be desired to'regnlate the initial position of the piston by means of the adjustinglever 34 and the sleeve 26. having the recess therein 26", in which case thetooth or pawl 341- oflthe lever 34 is disposed with in either of said recesses 36, that may be deemed preferable, for regulating the time of'the first interval of the operationoi'itaking the picture that isfthe time elapsing between the setting of the device before the signal is given forthe exposureso that it desired, one of there a brief interval is cesses DJOIGJ'GDIOtG from the head 29 of the sleeve is employed for engaging the pawl 3 B of the lever 34 andlthe result will be,v

as follows The lug lQjis lined position on the interior of the cylindrical member 12; and? the shoulder lO -on the spring 40,'isat a fixed; position lone'itudinally of the cylindrical tube 21, so that with. given. spring pressure chamber, if the piston were always set at the extreme position farthest within the easinggas shown inFigure's 1, 3, 5, 7 and 9,,

the time or interval between the release'ot;

the device, by disengaging'the pawl 34% of the lever 34; from the recess 26 to the time when the :shoulder w would comein con:

tact with the lug 42'; would always be the.

same, butif'the head- 27 is. so adjusted, that the pawlfia of the lever. 34 willengage the second, third, fourth or fifth or sixthof, the

recesses 26, then the interval of time pass ing from'the releasinggof' the lever ,to' the] time. when the shoulder 40 engagesthelug. 4&2 Wlll: be proportionately reduced,

Thusit will be seenfl ho'w the first interval of time ,may, be ee'u-laited'pby setting-the head 27065 the 'sleeve 2 6g so as, to engage the .1

desired recess of'ithe/sleeve. lnorder to inalte the variations of the" time of th 'is inrec and'ag'iven leakage of air into the piston. i-

" head 27.

terval correspond the numbers inscribed-on the faceof the head 2"] it will be only necessary to regulate the air valve by rotating the screw 19, so as to afford a su'iiicient amount of .air'

to regulate the travel of the piston 21, by

force-of the spring 15, sothat the time'of travel fromthe first position would "be equal to seconds, and the-last position 5 seconds. Thenthe time it "would require. the second,v

for the piston to travel from third, fourth or fifth position, respond in her denoted would corupon the dialsurface 29 or" It has hereinbefore been ful scribed how the dial 530, the indicator'52,

the cam 43, the threaded rod and the hand nut 51 and the gear 49 cooperate with the tubular piston 12and spring 15 and other features of the device for regulating the second interval in the operation of the '7 device or the time after the second signal crease the length of time follows is given and before the shutter of the camera is opened for the exposure of the negative by positioning the threaded rod 45, so as to increaseor deafter the shoulder by the lug 42, bethe cam 43.

4O has been. disengaged tore the shoulder 40 engages It will be seen that when the proper ad-- justment of the air valve19 has been attained so as to regulate the movement of the piston 21, so that the time required for the movement thereof will correspond in seconds with the numbers inscribed upon the dial surface 29 of the piston head 27. The adjustment of the cam 43 upon the rod 45 can then be regulated in such a manner that with the rotation of the thumb nut 51 and the indicator 52, the interval or" time required for the passage of the piston during the second interval or from the time the shoulder 40 is disengaged'from the lug 42 to the time when it 1s engaged by the cam I 43, will also be so regulated that'the indicator will corresponding with the time in such interval.

Finally, the operation of the device is as point to a number on the dial seconds of The dials being set and the device being so adjusted as to operate in the time indicated by the dials, then the lever 34 is brought into engagement with the recess 26.

in seconds of time "with.

seconds of timewi-th the I111111- the LYClGr.

the cam 43 uponv the picture during signal thereof. This will indicate that llh-i mediatelyqor within one, two orgthree sec-,1

onds, foreXample. the shuttero'ithe camera will open for the exposure.

'tervaliwill be the, exposure of the negative and during this time 'thejsecond" folding member. 65. W illbejelevated and the blue signal visible to? the eye; When the ex-v posure will be given, that is the folding membn v The next in- Y;

has been completed, the third signal 66 will be iraisedland a' white s ignal visible to the eye indicating that theiiexposure got the negative is completed and the shutter ofthe camera-closed. k While Ihave limited the description or my invention. inthefforiegoing, specification vice shown in; the drawinggTdo-not wish to be understood' to-be limited thereby, but reserve the righttodepart'therefrom within the reasonable spirit and scope of this invention, realizing that the device may be constructed in .many various forms with the same mechanical result and without departtion. 7 Having thusdescribed my invention, what I claim as new thereof and desire to secure by Letters Patent'oi' the United States, is:

1.. In a device of thecharacter described, means for controlling a camera shutter comprising a casing having a cylindrical chamquite closely to the construction :ofthe deher, a cylindrical element fitted within said casing, and being open at one end and closed at the other, and a reciprocating piston within said cylindrical element, valvemeans for admitting air to saidcylindrical elementand piston, and valve-means oper-. able by the plungerj'el-enient' for releasing air.

means for controlling a" camera shutter com prising a casing having cylindrical chamber, a cylindrical element fitted within-said casing and being open atone endand closed at'the' other,'and a reciprocating manually 2. In a device of.the'character described,

rotatable and springractuated piston within said cylindrical element, adjustable valvemeans for admitting'air to said cylindrical;

element and piston, and spring-actuated 1 valve-means operable by the plunger-ole; ment for releasing air. 1

3. Ina device of the character described,

means for controlling acam-era shutter. comprising a casing having a cylindrical chamher, a cylindrical element fittedwithin said. casing and being open at one end able manually operable and spring-actuated piston within said cylindrical element, ad-i justable valve- Jeans for admitting air to and closed V at the other, anda reciprocating and rotat said cylindricalelement and piston,]andv a normally closed springwalve tively confining air within said permitting for alterna- ,7 piston and escape of air therefrom, and 1 ing from the object andscop e of my invenprising a casing havingiacyliirdrical cham berm cylindrical ele'lllellb'fit-td Wlfi'hlll' sa1d means opera'ibldb y the plunger element for instantanccusly opningf said spring valve, I a-nd 'm'e'zmsf for subsequently maln'taanlng cha Ebcr and being: open: at on'e end and.

closed at thect hcr nd, and a5 reciprocating V ment, and sprlngbctuated means for sclec and IfOt EiHL O'QG1112111112113 operable and :spr ihgact uai' cd' piston W1 thln sand *cyhndrlczd el'emm, adjustable valve-manly for admittingair to said cylindrical element and p'iston, and a normally closed 's'prmgwa h e for a1;

and: perihittingescztpg Of'ail mezins op-crab] e by: the p111 nger-elemcnt for said valve open and. means for V I, ggugmg U161 chamber and being cpen "at one end--and closed at the other end, and (pll'ecip-l'ocatiing" and rotatable manually,operablflnd spring-- actuated p1sfi011 Wlthln sand cyhndrlcal eletively limiting the -nwvenln'tsoi the piston, l and lndlcat'or means forgaugmgsmd m0Vcments, combined With' the, antinous releasing means 'of a, camera shutter an'd si'gzial means as shownand described. V 1 I Signed at thevcity of'New York, State of New York, phisBd day ofOct5A. 11,1920.

1 GEORGE 'J. ,FISGHER-.-

for indicating. the operations, substantially 

